Steel alloy



a f and Sept. 2c, 1927.

PATENT orrncs.

LINWOOD in. snow, or rrr'renuaen, rnunsrnvma.

"s'rnnz. mom

Io Drawing.

My invention relates to steel alloys, and one particularly to the class of steel alloys used in making cutting tools. a

One object of the invention is to provide 5 a steel 'alloy which combines increased strength and toughness with improved hardening, -cutting and percussive qualities.

Another object of the invention is the provision of a steel .alloy which readily permits of the heattreatment to which sucl alloy steels are subjected throughout a .wide range in temperatures. I

.With this and other objects in view, the

invention consists in a steel alloy of the composition and ranges inproportions hereinafter described and particularly specified in the appended claimsf In making my -,improved alloy, which preferably will be made in an electric furnace, the alloying elements and approximate ranges in proportions by'welght of the various elements in the finished alloy will be substantially as follows Per cent. v

Carbon 0. 40 to 1.00 Manganeseuu 0.50 to 1.50

1.50 170 2.50 Molybdenum e 0.15 to 1.50 Vanadium i0. 15 to .50 Combined molybdenum and"v vanadium. 1 0101.00

The impurities, phosphorous and sulfur, will-be .04' 1* cent or under, and the iron content wil be sufiicient tb'make 100 per I cent.

.In addition to the above alloying .elements uranium, in amounts of from .15 to u .50 per cent-may be added, the amount of iron in the composition being correspondingly lessened. When used, theuranium wil replace a corresponding amount of molybdenum'or vanadium or part of each of these-two elements.

The carbon, manganese silicon will be added tothe. bath in the furnace, and'the' Application filed February, 1927. lerialllo. 168,288,

molybdenum and vanadium "additions referably, although not necessarily, wi be made in the ladle. When used the uranium will be added to the metal in the ladle In making my improved steel allo ferroalloys of 81110011, manganese, moly enum, vanadium and uranium will be found best for-"use.

The advantages of my invention result from the use in a high silicon 11110 of the molybdenum and vanadium with t other alloying elements within the range in proportions specified. Alloys made in accordance with my invention have very great resistance to crystallization or fatigue and are particularly well adapted for use as rock drills and similar percussive tools.

partingfrom my invention asdefined in' the a pended claims.

I c aim- V 1'. A steel alloy containing from 0.40 to 1.00 per cent carbon, from 0.50 to- L per cent manganese and having from 1.50 to 2.50 per cent silicon, 0.70 per cent molybdenum and OJOper cent vanadium al yed therewith.

2. A steel allov containin from 0.40 to 1.007per cent'carbon, from (50 to 1.50 per cent manganese, from 1.50 to 2.50 per cent silicon, and a combined molybdenum and vanadium content of from, 0.50 to 1.00 per cent and having at least .15 percent molybdenum= or vanadium.

'3. A steel allo eontainingfrom .40 to 1.00 per cent car 11, from .50 to'1.50 per cent manganese, from 1.50 to 2.50 per cent Y silicon, a combined molybdenum and vii-'- n'adiuin content of from .50 to .70 Fer cent and having at least .15 per cent 0 moly defium or vanadium. f In testimony whereof-'1 have hereunto slgned my" name.

Lmwoon n. snows. 

